I very often feel the need of posting a comment to simply say thanks for some idea in a comment, like a nice reference or a pedagogic suggestion, or simply to remark that the answer I accepted was the best one but anyway the other answer was helpful too.
That comments are not physics, strictly speaking they are sort of noise. Provided that one tries to restrict them to a discreet minimum, are they bad and should be avoided? (Note that I already know that comments can be upvoted, though anonymously)
Tha... sorry. You see? It's difficult...